Pyrolysis-induced synthesis of iron and nitrogen-containing carbon nanolayers modified graphdiyne nanostructure as a promising core-shell electrocatalyst for oxygen reduction reaction

Boosting ORR/OER Activity of Graphdiyne by Simple Heteroatom Doping

“…An analogue of graphene is graphdiyne: a semiconductor that consists of carbon hexagonal rings (sp 2 ‐hybridized C) and diacetylenic linkages (CCCC, sp‐hybridized C) . Recently, N‐doped graphdiynes emerged as promising ORR metal‐free catalysts, with low overpotential, small crossover effect, and long‐term stability . For example, Liu et al prepared N‐doped graphdiyne by heating graphdiyne under high‐purity ammonia mixed with argon.…”

Fe,N‐Codoped Graphdiyne Displaying Efficient Oxygen Reduction Reaction Activity

“…[6] Amongt hem, iron-nitrogen-carbon (Fe-N-C)c omposited catalysts have emerged as one of the most promising nonprecious metal catalysts with high catalytic activity,s uperiorm ethanol tolerance, and low cost. [7] However,d espite the great performance, some problems also exist in theseF e-N-C catalysts. Because of the low adsorption energy between Fe and Cmaterials, al ot of Fe precursor is needed to produceF e-N-C catalysts with only as mall amount of doped Fe.…”

Electrochemical Reduction of CO2 on Nitrogen‐Doped Carbon Catalysts With and Without Iron

“…This expectation is based on previous works that evidence the nature of nitrogen doping in different carbon matrices (similar to these used in this work), as determined by X-ray photoelectron spectroscopy (XPS), Mössbauer spectroscopy (Mössbauer), Fourier transform Infrared spectroscopy (FTIR), Raman spectroscopy (Raman), X-ray absorption near-edge structure (XANES), extended X-ray absorption fine structures (EXAFS), etc. [30,31,[33][34][35][36] Here, similarly to the above approaches, structures/ compositions of the different catalysts had been characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy (Raman), Transmission electron microscopy (TEM), High-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) and N 2 adsorptiondesorption isotherms.…”

“…%) species, respectively, as usually found in the literature. [35,[40][41][42][43][44][45][46] Figure S3 shows the high-resolution Fe 2p spectrum deconvoluted into four components and indicating the presence of small peaks at 707.0 eV (3 at.%) and 719.6 eV (3 at.%), which may be attributed to metallic iron and Fe 2 O 3 , [39,48,49] respectively. In addition, peaks at 711.0 eV (53 at.…”

“…Here, the I D /I G relation (integrated areas of the D and G deconvoluted peaks) is slightly higher for both catalysts in comparison to that for the Black Pearls® carbon, which may be ascribed to the higher degree of defects generated by nitrogen doping into the carbon matrices, as described in previous works. [34][35][36][37] The nitrogen adsorption- 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 desorption isotherms shown in Figure S4 are typically type I, indicating the existence of microporous structures, although the P 0 /P range above 0.9 exhibit a profile that also suggest the presence of macropores. [50] The specific surface areas estimated by BET (Brunauer-Emmett-Teller), pore volumes and pore diameters for NC(NH 3 ) and Fe/NC(NH 3 ) (including Black Pearls® carbon) are presented in Table S1 (Supporting Information).…”